Knowing Grandma Donna was not happy to wind up in the hospital, Shelby Hennick, 21, of California, knew exactly how to cheer her up.

Hennick then put her plan into action, wrapping up her grandmother’s dog Patsy in a blanket like a baby. The disguise was convincing enough to get her past hospital officials and into Grandma Donna's room.

“She’s had this dog forever, and this dog is her baby,” Hennick told InsideEdition.com.

She explained her Grandma Donna had 13-year-old Patsy since she was just a puppy, and even bottle fed her as a newborn.

“She was small enough to fit in the palm of her hand,” Hennick said.

The 79-year-old had to be hospitalized for several days after a poor reaction to some medication. It was the longest period of time that Patsy and Grandma Donna had been apart.

That's why Hennick knew she had to step in, and bring in Patsy for the visit.

Dogs are actually permitted in the hospital, but they must have papers saying that they're up to date with their shots and clean, documentation Hennick was unable to get.

"It was just so spur of the moment and I didn’t have time to go to my grandma’s veterinarian’s office,” said Hennick, who's a vet tech.

That’s when Hennick and her mom came up with the scheme to smuggle Patsy into the hospital in the baby disguise.

“Nobody would have stopped me to see my baby,” she laughed. ”The worst they could have told me was to leave.”

But the risk was worth it, she said, when she noticed her grandmother’s mood improve in the company of her beloved dog.

"It made her a lot happier," Shelby said. "She wasn’t feeling very good and it made her more relaxed. She did go home the next day. Medically, it didn’t have anything to do with Patsy, but I’m still thinking it had a little bit to do with her."